210 Journal New York Entomological Society, t^'o'- xxiv, 



7. Wings with faint violet and blue mixed throughout, scutellum sharply 



truncate behind brasilianorum cubaecola (Lucas) 



Wings with a faint tint of violet at the apical margin, scutellum almost 

 truncate behind brasilianorum aeneipennis (De Geer) 



8. Hairs of abdomen yellowish white or pale ochraceous on first segment 



only 9 



Hairs of abdomen yellowish white or pale ochraceous elsewhere besides 

 on first segment 10 



9. Labrum triangular and consisting of one lobe virginica Linne 



Labrum oblong, emarginate in the middle, and apparently consisting of 



two lobes calif ornica Cress, 



10. Frontal carina very large and blunt texana Cress. 



Frontal carina very small and pointed 11 



11. A short furrow midway between the posterior ocelli and ending in the 



median ocellar groove; body-color bluish purple micans Lep. 



No such furrow present ; body-color black tabanifonnis Smith 



12. Mandibles with a large yellow spot at the base 13 



Mandibles without a yellow spot at the base or with but a very small 



one 17 



13. Integument entirely fulvous 14 



Integument entirely black 16 



14. Upper side of flagellum with white pubescence, frontal carina obsolete, 



form robust fimbriata Fabr. 



Upper side of flagellum without white pubescence, frontal carina small, 

 form not robust 15 



15. A dark brown area on middle of the clypeus, a black ring surrounding 



each ocellus brasilianonim aeneipennis (De Geer) 



No such markings on clypeus or surrounding the ocelli. 



brasilianorum brasilianorum Linne. 



16. Abdominal hairs entirely black orpifex Smith. 



Abdominal hairs white on the hind margin laterally of all but the last 



segment tabanif ormis Smith 



17. Front of head entirely dark colored 18 



Front of head with yellow on labrum, clypeus, and frontal shield 19 



18. Wings fuliginous, integument brilliant blue, white abdominal hairs on 



first segment only arizonensis Cress. 



Wings fusco-hyaline, integument green, white abdominal hairs on segments 

 one and four and a few on the sides . calif ornica Cress. 



19. Antennas entirely dark colored 20 



Antennas with a yellow line on the lower side of the first segment. 



micans Lep. 



20. Head with yellowish white hairs on cheeks, vertex, and a patch between 



antennas texana Cress. 



Head with black hairs on cheeks, vertex, and between insertions of an- 

 tennae virginica Linne. 



